Issue #3111
- enable vt-x in kernel configuration
Kernel patches:
- add unrestricted guest support
- avoid kernel boot failure when vt-x is not available
- avoid nullpointer in kernel when vcpu is not fully setup
- avoid vcpu scheduling bug which causes starvation on same/below prio level
- save efer register correctly from guest
The pattern rule picked up the wrong platform_services.cc in the
depot-archive case only because the archive integrates generic and
sel4-specific source files into REP_DIR.
